The SentriKEY app updates automatically with normal smart phone usage. Lockbox hours of availability are 8am to 9pm 7 days a week. This cannot be changed. If you have a key card, you can update it after 4:00 pm the previous day for an early morning showing. Please be sure to update the card again on the day of showing after you are done at the property so that the proper contact information gets sent to the listing agent.